Corrugated rotary sieve.



0. L. LARSON.

CORRUGATED ROTARY SIEVE.

APPLICATION FILED SEPT. 5, 1914.

1,139,041 Patented May 11, 1915.

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OLE L. LARSON, 0F MINNEAPOLIS, MIN NESOTA.

CORRUGATED ROTARY SIEVE.

Application filed September 5, 1914.

To all whom it may concern:

Be it known that I, OLE L. LARSON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Corrugated Rotary Sieves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to rotary sieves, and is particularly directed to the provision of an improved cleaning device for corrugated rotary sieves of the character disclosed and claimed in my pending application, Serial Number 819,959, filed February 20th, 1914:, and entitled Corrugated rotary sieve.

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims. In fact, a corrugated rotary sieve constructed from wire netting has been found highly efficient for the separation of wheat and oats and various other materials, but there has been considerable difficulty in providing efiicient sieve cleaning devices for rotary sieves of the above noted character. Oats frequently pass partly through the meshes of such a sieve and become lodged or caught therein. Efficient separation requires that these oats and like objects be constantly forced out of the sieve meshes, so that the entire sieve surface is always operative.

I have found that a corrugated roller arranged to work against the outer corrugated surface of the sieve makes the most eflicient kind of cleaning device.

The preferred form of the arrangement above indicated is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a plan view of the improved sieve and cleaning device; Fig. 2 is a vertical section taken on the line :0 m on Fig. 1; and Fig. 3 is a transverse vertical section taken on the line 00 m on Fig. 1.

The numeral 1 indicates a suitable framework having bearings 2 in which a shaft 3 is journaled. This shaft 3 carries spiderlike heads 4: which, in turn, carry the woven wire sieve 5. The said sieve 5 has a general Specification of Letters Patent.

Patented May 11, 1915.

Serial No. 860,457.

cylindrical form, but is formed with longitudinally extended circumferentially spaced corrugations so closely positioned that the said corrugations run, one into the other. On one end of the shaft 3 is shown a pulley 6 over which a power driven belt, not shown, may be run to impart rotary motion to the sieve.

The numeral 7 indicates a corrugated cleaning roller, the corrugations of which run in the corrugations of the sieve 5, much like a gear. This cleaning roller 7 is preferably also made from woven wire screen bent to form longitudinally extended circumferentially spaced corrugations. The ends of the said roller forming sieve 7 are attached to heads 8 which are preferably provided with trunnions 9 loosely seated in the open seats 10 of bearing brackets 11 that are secured on the end portions of the frame 1, immediately above the ends of the corrugated sieve 5. The cleaning roller is thus gravity seated on the corrugated sieve in such manner that its corrugations will closely engage the corrugations of the sieve, but the said cleaning roller will be free to rise and fall to adapt itself to all irregularities in the corrugated sieve. In this way, the best possible kind of a cleaning action is obtained and the cleaning roller, in addition to its frictional contact with the corrugated surface of the sieve, will vibrate more or less and increase the sieve cleaning action by setting up a vibration therein, which vibration, furthermore, increases the separating efiiciency of the sieve.

It will, of course, be understood, that in the grain separating action, the grain will be fed into one end of the corrugated sieve 5 and will be fed out of the other end thereof, and that, hence, in practice, the said sieve will usually be given an inclination in a direction from its receiving toward its delivery end. I

The best arrangement of the cleaning roller is substantially that illustrated in the drawings, but any kind of a corrugated rotary cleaning roller or member, engageable with the corrugated sieve and rotating with a gear-like engagement in connection therewith, would be within the scope of my invention.

What I claim is:

1. The combination with a rotary longitudinally corrugated sieve, of a rotary corrugated sieve cleaning device engaging the gagement with the corrugations of said 10 corrugated sieve and having a gear-like rosieve. tating contact therewith. In testimony whereof I afliX my signature 2. The (cio fnbination with a I{rotary iieve in presence of two witnesses. constructe roIn wire nettin ent to orm longitudinally extended cir cumferentially OLE LARSON spaced corrugations, of a corrugated sieve Witnesses: cleaning roller also constructed from wire BERNIOE G. WHEELER, netting rotatably mounted for gear-like en- HARRY D. KILGORE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C. 

